This is late in coming, but Rob Jarratt has published the WCF recording tool he has been working on to CodePlex at http://www.codeplex.com/wcfloadtest.
This is a really cool tool that will convert a WCF log file into a unit test that will replay the log. It came out of a load test engagement the services test labs did with a customer, so it is a proven solution.
If you are doing load testing on WCF, this tool provides a way to essentially record and playback the WCF traffic from an application.
I've added a link to the project on my Links to Content Index for Web Tests and Load Tests page.